multitasking lag?

So I'm late to this party (this forum, got the phone on day 1), but I've noticed that there's a considerable amount of lag if I play a song and try to do something else (like type this message- the screen is five or six letters behind my fingers). No gps or wifi and just a gmail and yahoo sync and full bars on 3G. Is this right? Is it supposed to drag like this, or did my processor catch the swine before they gave it to me?